Merge branch 'rothbardian-master-patch-09539' into 'master'

Update SIDH to CSIDH in end_to_end.md

See merge request xx_network/docs!5

website/docs/cmixx/design-specs/end_to_end.md

@@ -38,6 +38,10 @@ exchanged less frequently than every message.
 * [Diffie–Hellmen](https://en.wikipedia.org/wiki/Diffie%E2%80%93Hellman_key_exchange): Length is 3072 bits. Discrete log-based component of key negotiation.
 * [SIDH](https://sike.org/files/SIDH-spec.pdf): Length of public key is 3024 bits. Quantum resistant component of key negotiation.
 
+:::note
+In cMixx SIDH was later replaced by CSIDH
+:::
+
 ## Auth Request Response Protocol
 
 The Auth Request Response Protocol is similar a two way handshake